Valve Spring: Service and Repair

Valve Springs





Special Tool(s)

Removal
1. Remove the roller followers.
2. Remove the spark plugs.
3. Position the piston of the cylinder being serviced at the bottom of the stroke.





4. CAUTION: If air pressure has forced the piston to the bottom of the cylinder any loss of air pressure will allow the valve to fall into the cylinder. If air pressure must be removed support the valve prior to removal.

Use compressed air in the cylinder to hold both valves in position.





5. Using the special tool, compress the intake valve spring.





6. NOTE: Valve stem seals should be visually inspected if new seals are not installed.

Remove the valve spring retainer keys, the valve spring retainer, and the valve spring.





7. Using the special tool, compress the exhaust valve spring.





8. NOTE: Valve stem seals should be visually inspected if new seals are not installed.

Remove the valve spring retainer keys, the valve spring retainer, and the valve spring.

Installation





1. Install the special tool between the valve spring coils to protect the intake valve stem seal from damage.





2. Using the special tool, install the exhaust valve spring, the spring retainer and the valve spring retainer keys.
3. Remove the special tools and the compressed air hose from the cylinder.
4. Install the spark plugs.
5. Install the roller followers.